week - script and chart function

This function returns an integer representing the week number corresponding to the date entered.

Syntax:

week(timestamp [, first_week_day [, broken_weeks [, reference_day]]])

Return data type: integer

Arguments
Argument	Description
timestamp	The date or timestamp to evaluate.
first_week_day	Specifies the day on which the week starts. If omitted, the value of variable FirstWeekDay is used. The possible values first_week_day are 0 for Monday, 1 for Tuesday, 2 for Wednesday, 3 for Thursday, 4 for Friday, 5 for Saturday, and 6 for Sunday. For more information about the system variable, see FirstWeekDay.
broken_weeks	If you don't specify broken_weeks, the value of variable BrokenWeeks will be used to define if weeks are broken or not. For more information about the system variable, see BrokenWeeks
reference_day	If you don't specify reference_day, the value of variable ReferenceDay will be used to define which day in January to set as reference day to define week 1. By default, Qlik Sense functions use 4 as the reference day. This means that week 1 must contain January 4, or put differently, that week 1 must always have at least 4 days in January. For more information about the system variable, see ReferenceDay

The week() function determines which week the date falls into and returns the week number.

In Qlik Sense, the regional settings are fetched when the app is created, and the corresponding settings are stored in the script as environment variables. These are used to determine the week number.

This means that most European app developers gets the following environment variables, corresponding to the ISO 8601 definition:

Set FirstWeekDay =0; // Monday as first week day Set BrokenWeeks =0; // Use unbroken weeks Set ReferenceDay =4; // Jan 4th is always in week 1

A North American app developer often gets the following environment variables:

Set FirstWeekDay =6; // Sunday as first week day Set BrokenWeeks =1; // Use broken weeks Set ReferenceDay =1; // Jan 1st is always in week 1

The first day of the week is determined by the FirstWeekDay system variable. You can also change the first day of the week by using the first_week_day argument in the week() function.

If your application uses broken weeks, the week number count begins on January 1 and ends on the day prior to the FirstWeekDay system variable regardless of how many days have occurred.

If your application is using unbroken weeks, week 1 can begin in the previous year or in the first few days of January. This depends on how you use the FirstWeekDay and the ReferenceDay environment variables.

When to use it

The week() function is useful when you would like to compare aggregations by weeks. For example, it could be used if you would like to see the total sales of products by week. The week() function is chosen over weekname() when the user would like the calculation to not necessarily use the application’s BrokenWeeks, FirstWeekDay, or ReferenceDay system variables.

For example, if you want to see the total sales of products by week.

If the application is using unbroken weeks, week 1 may contain dates from December of the previous year or exclude dates in January of the current year. If the application is using broken weeks, week 1 may contain less than seven days..

Regional settings

Unless otherwise specified, the examples in this topic use the following date format: MM/DD/YYYY. The date format is specified in the SET DateFormat statement in your data load script. The default date formatting may be different in your system, due to your regional settings and other factors. You can change the formats in the examples below to suit your requirements. Or you can change the formats in your load script to match these examples.

Default regional settings in apps are based on the regional system settings of the computer or server where Qlik Sense is installed. If the Qlik Sense server you are accessing is set to Sweden, the Data load editor will use Swedish regional settings for dates, time, and currency. These regional format settings are not related to the language displayed in the Qlik Sense user interface. Qlik Sense will be displayed in the same language as the browser you are using.

The examples below assume

Set DateFormat= 'MM/DD/YYYY'; Set FirstWeekDay=0; Set BrokenWeeks=0; Set ReferenceDay=4;

Function examples
Example	Result
week('12/28/2021')	Returns 52.
week(44614)	Returns 8, since this is the serial number for 02/22/2022.
week('01/03/2021')	Returns 53.
week('01/03/2021',6)	Returns 1.

Example 1 – Default system variables

Overview

Open the Data load editor and add the load script below to a new tab.

The load script contains:

A dataset containing a set of transactions for the last week of 2021 and the first two weeks of 2022, which is loaded into a table called Transactions.
The date field provided in the DateFormat system variable (MM/DD/YYYY) format.
The creation of a field, week_number, that returns the year and week number when the transactions took place.
The creation of a field called week_day, showing the weekday value of each transaction date.

Load script

SET DateFormat='MM/DD/YYYY';
SET FirstWeekDay=6;
SET BrokenWeeks=1;
SET ReferenceDay=0;

Transactions:
    Load
        *,
        WeekDay(date) as week_day,
        Week(date) as week_number
        ;
Load
*
Inline 
[
id,date,amount
8183,12/27/2021,58.27
8184,12/28/2021,67.42
8185,12/29/2021,23.80
8186,12/30/2021,82.06
8187,12/31/2021,40.56
8188,01/01/2022,37.23
8189,01/02/2022,17.17
8190,01/03/2022,88.27
8191,01/04/2022,57.42
8192,01/05/2022,53.80
8193,01/06/2022,82.06
8194,01/07/2022,40.56
8195,01/08/2022,53.67
8196,01/09/2022,26.63
8197,01/10/2022,72.48
8198,01/11/2022,18.37
8199,01/12/2022,45.26
8200,01/13/2022,58.23
8201,01/14/2022,18.52
];

Results

Load the data and open a sheet. Create a new table and add these fields as dimensions:

id
date
week_day
week_number

Results table
id	date	week_day	week_number
8183	12/27/2021	Mon	53
8184	12/28/2021	Tue	53
8185	12/29/2021	Wed	53
8186	12/30/2021	Thu	53
8187	12/31/2021	Fri	53
8188	01/01/2022	Sat	1
8189	01/02/2022	Sun	2
8190	01/03/2022	Mon	2
8191	01/04/2022	Tue	2
8192	01/05/2022	Wed	2
8193	01/06/2022	Thu	2
8194	01/07/2022	Fri	2
8195	01/08/2022	Sat	2
8196	01/09/2022	Sun	3
8197	01/10/2022	Mon	3
8198	01/11/2022	Tue	3
8199	01/12/2022	Wed	3
8200	01/13/2022	Thu	3
8201	01/14/2022	Fri	3

The week_number field is created in the preceding load statement by using the week() function and passing the date field as the function’s argument.

No other parameters are passed into the function, and therefore the following default variables that affect the week() function are in effect:

BrokenWeeks: The week count begins on January 1
FirstWeekDay: The first day of the week is Sunday

Diagram displaying how the week function breaks up the dates of year into corresponding week numbers. Here, default system variables lead week 1 to begin on January 1, with week 2 starting on January 2. — Diagram of week() function, using default system variables

Because the application is using the default BrokenWeeks system variable, week 1 begins on January 1, a Saturday.

Because of the default FirstWeekDay system variable, weeks begin on a Sunday. The first Sunday after January 1 occurs on January 2, which is when week 2 begins.

Example 2 – first_week_day

Overview

Open the Data load editor and add the load script below to a new tab.

The load script contains:

The creation of a field, week_number, that returns the year and week number when the transactions took place.
The creation of a field called week_day, showing the weekday value of each transaction date.

In this example, we would like to set the start of the work week to Tuesday.

Load script

SET DateFormat='MM/DD/YYYY';
SET FirstWeekDay=6;
SET BrokenWeeks=1;
SET ReferenceDay=0;

Transactions:
    Load
        *,
        WeekDay(date) as week_day,
        Week(date,1) as week_number
        ;
Load
*
Inline 
[
id,date,amount
8183,12/27/2022,58.27
8184,12/28/2022,67.42
8185,12/29/2022,23.80
8186,12/30/2022,82.06
8187,12/31/2021,40.56
8188,01/01/2022,37.23
8189,01/02/2022,17.17
8190,01/03/2022,88.27
8191,01/04/2022,57.42
8192,01/05/2022,53.80
8193,01/06/2022,82.06
8194,01/07/2022,40.56
8195,01/08/2022,53.67
8196,01/09/2022,26.63
8197,01/10/2022,72.48
8198,01/11/2022,18.37
8199,01/12/2022,45.26
8200,01/13/2022,58.23
8201,01/14/2022,18.52
];

Results

Load the data and open a sheet. Create a new table and add these fields as dimensions:

id
date
week_day
week_number

Results table
id	date	week_day	week_number
8183	12/27/2021	Mon	52
8184	12/28/2021	Tue	53
8185	12/29/2021	Wed	53
8186	12/30/2021	Thu	53
8187	12/31/2021	Fri	53
8188	01/01/2022	Sat	1
8189	01/02/2022	Sun	1
8190	01/03/2022	Mon	1
8191	01/04/2022	Tue	2
8192	01/05/2022	Wed	2
8193	01/06/2022	Thu	2
8194	01/07/2022	Fri	2
8195	01/08/2022	Sat	2
8196	01/09/2022	Sun	2
8197	01/10/2022	Mon	2
8198	01/11/2022	Tue	3
8199	01/12/2022	Wed	3
8200	01/13/2022	Thu	3
8201	01/14/2022	Fri	3

The application is still using broken weeks. However, the first_week_day argument has been set to 1 in the week() function. This sets the first day of the week to a Tuesday.

Diagram displaying how the week function breaks up the dates of year into corresponding week numbers. Here, with weeks beginning on Jaunary 2, week 1 of the year starts on January 1 and week 2 starts on January 4. — Diagram of week() function, first_week_day example

The application is using the default BrokenWeeks system variable, so week 1 begins on January 1, a Saturday.

The first_week_day argument of the week() function sets the first week day to a Tuesday. Therefore, week 53 begins on December 28, 2021.

However, because the function is still using broken weeks, week 1 will only be two days long, due to the first Tuesday after January 1 occurring on January 3.

Example 3 – unbroken_weeks

Overview

Open the Data load editor and add the load script below to a new tab.

The load script contains the same dataset and scenario as the first example.

In this example, we use unbroken weeks.

Load script

SET DateFormat='MM/DD/YYYY';
SET FirstWeekDay=6;
SET BrokenWeeks=1;
SET ReferenceDay=0;

Transactions:
    Load
        *,
        WeekDay(date) as week_day,
        Week(date,6,0) as week_number
        ;
Load
*
Inline 
[
id,date,amount
8183,12/27/2022,58.27
8184,12/28/2022,67.42
8185,12/29/2022,23.80
8186,12/30/2022,82.06
8187,12/31/2021,40.56
8188,01/01/2022,37.23
8189,01/02/2022,17.17
8190,01/03/2022,88.27
8191,01/04/2022,57.42
8192,01/05/2022,53.80
8193,01/06/2022,82.06
8194,01/07/2022,40.56
8195,01/08/2022,53.67
8196,01/09/2022,26.63
8197,01/10/2022,72.48
8198,01/11/2022,18.37
8199,01/12/2022,45.26
8200,01/13/2022,58.23
8201,01/14/2022,18.52
];

Results

Load the data and open a sheet. Create a new table and add these fields as dimensions:

id
date
week_day
week_number

ADD ALT TEXT HERE.....!!!!!! — Diagram of week() function, chart object example

Results table
id	date	week_day	week_number
8183	12/27/2021	Mon	52
8184	12/28/2021	Tue	52
8185	12/29/2021	Wed	52
8186	12/30/2021	Thu	52
8187	12/31/2021	Fri	52
8188	01/01/2022	Sat	52
8189	01/02/2022	Sun	1
8190	01/03/2022	Mon	1
8191	01/04/2022	Tue	1
8192	01/05/2022	Wed	1
8193	01/06/2022	Thu	1
8194	01/07/2022	Fri	1
8195	01/08/2022	Sat	1
8196	01/09/2022	Sun	2
8197	01/10/2022	Mon	2
8198	01/11/2022	Tue	2
8199	01/12/2022	Wed	2
8200	01/13/2022	Thu	2
8201	01/14/2022	Fri	2

The first_week_date parameter is set to 1, making Tuesday the first day of the week. The broken_weeks parameter it set to 0, forcing the function to use unbroken weeks. Finally, the third parameter sets the reference_day to 2.

The first_week_date parameter is set to 6, making Sunday the first day of the week. The broken_weeks parameter is set to 0, forcing the function to use unbroken weeks.

Diagram displaying how the week function breaks up the dates of year into corresponding week numbers. Here, since we use unbroken weeks, week 1 of the year starts on January 2, a Sunday. — Diagram of week() function, example using unbroken weeks

By using unbroken weeks, week 1 does not necessarily begin on January 1; instead, it is required to have a minimum of four days. Therefore, in the dataset, week 52 concludes on Saturday, January 1, 2022. Week 1 then begins on the FirstWeekDay system variable, which is Sunday, January 2. This week will conclude on the following Saturday, January 8.

Example 4 – reference_day

Overview

Open the Data load editor and add the load script below to a new tab.

The load script contains:

The same dataset and scenario as the third example.
The creation of a field, week_number, that returns the year and week number when the transactions took place.
The creation of a field called week_day, showing the weekday value of each transaction date.

Additionally, the following conditions must be met:

The work week begins on a Tuesday.
The company uses unbroken weeks.
The reference_day value is 2. In other words, the minimum number of days in January in week 1 will be 2.

Load script

SET DateFormat='MM/DD/YYYY';
SET FirstWeekDay=6;
SET BrokenWeeks=1;
SET ReferenceDay=0;

Transactions:
    Load
        *,
        WeekDay(date) as week_day,
        Week(date,1,0,2) as week_number
        ;
Load
*
Inline 
[
id,date,amount
8183,12/27/2022,58.27
8184,12/28/2022,67.42
8185,12/29/2022,23.80
8186,12/30/2022,82.06
8187,12/31/2021,40.56
8188,01/01/2022,37.23
8189,01/02/2022,17.17
8190,01/03/2022,88.27
8191,01/04/2022,57.42
8192,01/05/2022,53.80
8193,01/06/2022,82.06
8194,01/07/2022,40.56
8195,01/08/2022,53.67
8196,01/09/2022,26.63
8197,01/10/2022,72.48
8198,01/11/2022,18.37
8199,01/12/2022,45.26
8200,01/13/2022,58.23
8201,01/14/2022,18.52
];

Results

Load the data and open a sheet. Create a new table and add these fields as dimensions:

id
date
week_day
week_number

Results table
id	date	week_day	week_number
8183	12/27/2021	Mon	52
8184	12/28/2021	Tue	1
8185	12/29/2021	Wed	1
8186	12/30/2021	Thu	1
8187	12/31/2021	Fri	1
8188	01/01/2022	Sat	1
8189	01/02/2022	Sun	1
8190	01/03/2022	Mon	1
8191	01/04/2022	Tue	2
8192	01/05/2022	Wed	2
8193	01/06/2022	Thu	2
8194	01/07/2022	Fri	2
8195	01/08/2022	Sat	2
8196	01/09/2022	Sun	2
8197	01/10/2022	Mon	2
8198	01/11/2022	Tue	3
8199	01/12/2022	Wed	3
8200	01/13/2022	Thu	3
8201	01/14/2022	Fri	3

Diagram displaying how the week function breaks up the dates of year into corresponding week numbers. Here, week 1 begins on December 28, 2021, and concludes on Monday, January 3, 2022. — Diagram of week() function, reference_day example

With the function using unbroken weeks and a reference_day value of 2 used as a parameter, week 1 only needs to include two days in January. Due to the first weekday being Tuesday, week 1 begins on December 28, 2021, and concludes on Monday, January 3, 2022.

Example 5 – Chart object example

Overview

Open the Data load editor and add the load script below to a new tab.

The load script contains the same dataset and scenario as the first example.

However, in this example, the unchanged dataset is loaded into the application. The calculation that returns the week number is created as a measure in a chart object.

Load script

Transactions:
Load
*
Inline 
[
id,date,amount
8183,12/27/2022,58.27
8184,12/28/2022,67.42
8185,12/29/2022,23.80
8186,12/30/2022,82.06
8187,12/31/2021,40.56
8188,01/01/2022,37.23
8189,01/02/2022,17.17
8190,01/03/2022,88.27
8191,01/04/2022,57.42
8192,01/05/2022,53.80
8193,01/06/2022,82.06
8194,01/07/2022,40.56
8195,01/08/2022,53.67
8196,01/09/2022,26.63
8197,01/10/2022,72.48
8198,01/11/2022,18.37
8199,01/12/2022,45.26
8200,01/13/2022,58.23
8201,01/14/2022,18.52
];

Results

Do the following:

Load the data and open a sheet. Create a new table.
Add the following fields as dimensions:
- id
- date
Next, create the following measure:

=week (date)
Create a measure, week_day, to show the weekday value of each transaction date:

=weekday(date)

Results table
id	date	=week(date)	=weekday(date)
8183	12/27/2021	53	Mon
8184	12/28/2021	53	Tue
8185	12/29/2021	53	Wed
8186	12/30/2021	53	Thu
8187	12/31/2021	53	Fri
8188	01/01/2022	1	Sat
8189	01/02/2022	2	Sun
8190	01/03/2022	2	Mon
8191	01/04/2022	2	Tue
8192	01/05/2022	2	Wed
8193	01/06/2022	2	Thu
8194	01/07/2022	2	Fri
8195	01/08/2022	2	Sat
8196	01/09/2022	3	Sun
8197	01/10/2022	3	Mon
8198	01/11/2022	3	Tue
8199	01/12/2022	3	Wed
8200	01/13/2022	3	Thu
8201	01/14/2022	3	Fri

The week_number field is created in the preceding load statement by using the week() function and passing the date field as the function’s argument.

No other parameters are passed into the function, and therefore the following default variables that affect the week() function are in effect:

BrokenWeeks: The week count begins on January 1
FirstWeekDay: The first day of the week is Sunday

Diagram displaying how the week function breaks up the dates of year into corresponding week numbers. Here, week 1 begins on January 1, with week 2 starting on January 2. — Diagram of week() function, chart object example

Because the application is using the default BrokenWeeks system variable, week 1 begins on January 1, a Saturday.

Because of the default FirstWeekDay system variable, weeks begin on a Sunday. The first Sunday after January 1 occurs on January 2, which is when week 2 begins.

Example 6 – Scenario

Overview

Open the Data load editor and add the load script below to a new tab.

The load script contains:

A dataset containing a set of transactions for the last week of 2019 and first two weeks of 2020, which is loaded into a table called Transactions.
The date field provided in the DateFormat system variable (MM/DD/YYYY) format.

The application primarily uses broken weeks across its dashboard. However, the end user would like a chart object that presents the total sales by week using unbroken weeks. The reference day should be January 2, with weeks beginning on a Tuesday. This could be achieved even when this dimension is not available in the data model, using the week() function as a calculated dimension in the chart.

Load script

SET BrokenWeeks=1;
SET ReferenceDay=0;
SET DateFormat='MM/DD/YYYY';

Transactions:
Load
*
Inline 
[
id,date,amount
8183,12/27/2019,58.27
8184,12/28/2019,67.42
8185,12/29/2019,23.80
8186,12/30/2019,82.06
8187,12/31/2019,40.56
8188,01/01/2020,37.23
8189,01/02/2020,17.17
8190,01/03/2020,88.27
8191,01/04/2020,57.42
8192,01/05/2020,53.80
8193,01/06/2020,82.06
8194,01/07/2020,40.56
8195,01/08/2020,53.67
8196,01/09/2020,26.63
8197,01/10/2020,72.48
8198,01/11/2020,18.37
8199,01/12/2020,45.26
8200,01/13/2020,58.23
8201,01/14/2020,18.52
];

Results

Do the following:

Load the data and open a sheet. Create a new table.
Create the following calculated dimension:

=week(date)
Next, create the following aggregation measure:

=sum(amount)
Set the measure's Number formatting to Money.
Select the Sorting menu, and for the calculated dimension, remove custom sorting.
De-select the Sort numerically and Sort alphabetically options.

Results table
week(date)	sum(amount)
52	$125.69
53	$146.42
1	$200.09
2	$347.57
3	$122.01

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